I am asthmatic.i start feeling breathless randomly anytime.how to figure out what are the exact reasons that make me breathless so that i avoid them?

Keep a list: If available, skin testing would help. If not available, be alert to where you are when you get flares and look for common sensitizers. Common causes are insects (like roach parts), cat dander, and dust.

See an asthma doc: Asthma can be caused by a number of problems. Allergies are just one cause. Having your lung function evaluated and looking for inflammation in a non-invasive test called an exhaled Nitric Oxide test can be helpful in determining the severity of your asthma. Allergy tests can help to evaluate for a cause.

Know your triggers: Need more detaied history to identify triggers but your asthma is unstable.